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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
May 31, 2022
Mar. 31, 2022
Held-to-Maturity:        
Amortized Cost $ 658,596 $ 664,883    
Gross Unrealized Gains 145 0    
Gross Unrealized Losses (59,441) (68,103)    
Fair Value 599,300 596,780 $ 343,700 $ 329,500
ACL 0 0    
Available-for-Sale:        
Amortized Cost 801,506 801,370    
Gross Unrealized Gains 31 6    
Gross Unrealized Losses (114,349) (129,582)    
Fair Value 687,188 671,794    
ACL 0 0    
States and political subdivisions        
Held-to-Maturity:        
Amortized Cost 41,867 41,840    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (4,746) (4,727)    
Fair Value 37,121 37,113    
ACL 0 0    
Available-for-Sale:        
Amortized Cost 170,628 172,427    
Gross Unrealized Gains 26 6    
Gross Unrealized Losses (31,133) (36,681)    
Fair Value 139,521 135,752    
ACL 0 0    
Residential - U.S. Government-sponsored entities        
Held-to-Maturity:        
Amortized Cost 616,729 623,043    
Gross Unrealized Gains 145 0    
Gross Unrealized Losses (54,695) (63,376)    
Fair Value 562,179 559,667    
ACL 0 0    
Available-for-Sale:        
Amortized Cost 488,550 498,989    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (67,066) (75,186)    
Fair Value 421,484 423,803    
ACL 0 0    
Corporate securities        
Held-to-Maturity:        
Amortized Cost   0    
Gross Unrealized Gains   0    
Gross Unrealized Losses   0    
Fair Value   0    
ACL   0    
Available-for-Sale:        
Amortized Cost 36,087 36,206    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (4,990) (5,995)    
Fair Value 31,097 30,211    
ACL 0 0    
U.S. Treasury obligations and direct obligations of U.S. Government agencies        
Held-to-Maturity:        
Amortized Cost   0    
Gross Unrealized Gains   0    
Gross Unrealized Losses   0    
Fair Value   0    
ACL   0    
Available-for-Sale:        
Amortized Cost 26,533 28,032    
Gross Unrealized Gains 5 0    
Gross Unrealized Losses (2,195) (2,317)    
Fair Value 24,343 25,715    
ACL 0 0    
Residential - Non-government agencies        
Held-to-Maturity:        
Amortized Cost   0    
Gross Unrealized Gains   0    
Gross Unrealized Losses   0    
Fair Value   0    
ACL   0    
Available-for-Sale:        
Amortized Cost 9,614 9,829    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (977) (1,167)    
Fair Value 8,637 8,662    
ACL 0 0    
Commercial - U.S. Government-sponsored entities        
Held-to-Maturity:        
Amortized Cost   0    
Gross Unrealized Gains   0    
Gross Unrealized Losses   0    
Fair Value   0    
ACL   0    
Available-for-Sale:        
Amortized Cost 53,597 54,346    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (7,797) (8,202)    
Fair Value 45,800 46,144    
ACL 0 0    
Commercial - Non-government agencies        
Held-to-Maturity:        
Amortized Cost   0    
Gross Unrealized Gains   0    
Gross Unrealized Losses   0    
Fair Value   0    
ACL   0    
Available-for-Sale:        
Amortized Cost 16,497 1,541    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (191) (34)    
Fair Value 16,306 1,507    
ACL $ 0 $ 0